java System.in How can I use System.in.read()

Question

I am new in java.

I should use System.in.read() to solve my program

but I don't know ,what does it exactly do?

thanks for helping

my question :

take a number of user. If the number is less than 1, print an error. Otherwise, print the result of 2 ^ ( 1 incoming number ) . "Once with for AND Once with while "

'int i ; 
int  num ;
System.out.println("enter a number : ");
for (i=1 ; (num = System.in.read()) != '\r' ; i++  ) 
{

  if( num <1 )
  {
  System.out.println("illegal value! \n enter a number"); 
  }

      else
      {
        int j; int pow = 1;
        for (j = 1 ; j <= num ; j++) 
        {
          pow *=2 ;
          System.out.println(pow);
        }

  }
}`

score 0 · Answer 1 · answered Feb 24 '15 at 08:07

0

System.out.println("Please, Enter:");
    BufferedReader consoleIn =
        new BufferedReader(new InputStreamReader(System.in));
    String stringInt = consoleIn.readLine();
    int fromConsoleInput = Integer.parseInt(stringInt);

answered Feb 24 '15 at 08:07

V__

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question : take a number of user. If the number is less than 1, * print an error. Otherwise, print the result of 2 ^ ( 1 incoming number ) . * Once with for AND Once with while – Nasim Salmani Feb 24 '15 at 08:10
My code : int i ; int num ; System.out.println("enter a number : "); for (i=1 ; (num = System.in.read()) != '\r' ; i++ ) { if( num <1 ) { System.out.println("illegal value! \n enter a number"); } else { int j; int pow = 1; for (j = 1 ; j <= num ; j++) { pow *=2 ; System.out.println(pow); } } } – Nasim Salmani Feb 24 '15 at 08:10

java System.in How can I use System.in.read()

1 Answers1